Jupyter Server process terminated before the initialization completed

[samuelvw01]

Description

When I click on New session it shows error "Failed to create session! Jupyter Server process terminated before the initialization completed."
Reinstalling didnt help. Clicking on "Install / update Python environment using the bundled installer" hangs at "Installing".

Reproduce

1. Click on 'New session.'
2. See error ' Failed to create session! Jupyter Server process terminated before the initialization completed'

Expected behavior

New session should start

Context

• Operating System and version: Windows 10
• JupyterLab-Desktop version: 3.6.3-1
• Installer: .exe

Logs (required for issues with loading, server and startup)

[2023-05-04 14:44:54.534] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (C:\JupyterLab\resources\app.asar\build\out\main\server.js:282:28)
    at ChildProcess.emit (node:events:513:28)
    at ChildProcess._handle.onexit (node:internal/child_process:291:12)
[2023-05-04 14:44:58.883] [error] Failed to start server Error: Jupyter Server process terminated before the initialization completed
    at ChildProcess. (C:\JupyterLab\resources\app.asar\build\out\main\server.js:282:28)
    at ChildProcess.emit (node:events:513:28)
    at ChildProcess._handle.onexit (node:internal/child_process:291:12)
[2023-05-04 14:44:58.915] [error] (node:6972) UnhandledPromiseRejectionWarning: TypeError: Cannot read properties of undefined (reading 'protocol')
    at new LabView (C:\JupyterLab\resources\app.asar\build\out\main\labview\labview.js:45:50)
    at SessionWindow._loadLabView (C:\JupyterLab\resources\app.asar\build\out\main\sessionwindow\sessionwindow.js:274:25)
    at SessionWindow._updateContentView (C:\JupyterLab\resources\app.asar\build\out\main\sessionwindow\sessionwindow.js:680:18)
    at IpcMainImpl. (C:\JupyterLab\resources\app.asar\build\out\main\sessionwindow\sessionwindow.js:421:18)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
(Use `JupyterLab --trace-warnings ...` to show where the warning was created)
[2023-05-04 14:44:58.941] [error] (node:6972) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)

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[mbektas]

@samuelvw01 looks like your server launch is failing but logs are not showing enough details. can you try these:

1. Launch server manually using Windows Terminal and check terminal logs. Instructions here.
2. When JupyterLab Desktop is closed, install the Python environment directly by using the installer in C:\JupyterLab\resources\env_installer
3. If there are still errors, set log level to debug, retry launch and check and share main.log file by following these instructions.

[samuelvw01]

Launching server manually works without any errors. Installed Python environment (it says I had to delete jlab_server folder), but I got same error as above. Set log level to debug, here is my main.log
main.log

[mbektas]

Interesting, it was expected to error out in the same way when you tried manually. Did you activate the environment before launching the server manually? you can do so using:

• cd %APPDATA%\jupyterlab-desktop\jlab_server
• condabin\activate.bat

[samuelvw01]

Tried to run those commands, but still got that error. What is more interesting, I build jupyterlab-desktop from source and when I ran npm run start, it works normally. See the picture, the left one is installed from exe and the right one is when I ran npm run start

[mbektas]

@samuelvw01 now that you are able to run locally, can you try building it completely and installing using your own installer? Instructions are here.

[samuelvw01]

Thanks, that worked! (There were some conflicts during conda constructor phase, but I have resolved them). Now it runs as expected.